An in-phase/quadrature component (IQ) mixer is configured to reject returns from
a negative doppler shift swath in order to mitigate corruption of returns of a
positive doppler shift swath. The mixer includes a sample delay element which produces
a quadrature component from the in-phase component of an input signal. Further
included are a plurality of mixer elements, a plurality of low pass filters, a
plurality of decimators, and a plurality of all pass filters which act upon both
the in-phase and quadrature components of the input signal. Also, a subtraction
element is included which is configured to subtract the filtered and down sampled
quadrature component from the filtered and down sampled in-phase component.
